<template>
  <div>
    <ul>
      <li v-for="(item,i) in arr" :key="i">
        {{item}}
        <button @click="del(i)">删除</button>
      </li>
    </ul>
    <button @click="addFn">生成</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr:[1,5,3]
    }
  },
  methods:{
    addFn() {
      this.arr.push(Math.floor(Math.random()*20))
    },
    del(index) {
      this.arr.splice(index,1)
    }
  }
}
</script>

<style>

</style>